1 files changed, 11 insertions, 0 deletions
diff --git a/tests/ui/precondition-checks/ascii-char-digit_unchecked.rs b/tests/ui/precondition-checks/ascii-char-digit_unchecked.rs
new file mode 100644
index 00000000000..30c6f79fb08
--- /dev/null
+++ b/tests/ui/precondition-checks/ascii-char-digit_unchecked.rs
@@ -0,0 +1,11 @@
+//@ run-fail
+//@ compile-flags: -Copt-level=3 -Cdebug-assertions=no -Zub-checks=yes
+//@ error-pattern: unsafe precondition(s) violated: `ascii::Char::digit_unchecked` input cannot exceed 9
+
+#![feature(ascii_char)]
+
+fn main() {
+    unsafe {
+        std::ascii::Char::digit_unchecked(b'a');
+    }
+}